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Prototype, Test, Teach


Experiment with new materials by ordering Protoboxes or Sample Packs



Exclusively Providing 303 Sheet/Plate | Testing...


Onlinemetals is the only D2C metal supplier providing 303 sheet/plate in North America!


Alloy Steel Square Bar 4142-Prehardened
0.25" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19355
Starting at $36.21

$36.21

$36.21 ea.
Alloy Steel Square Bar 4142-Prehardened
0.3125" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19356
Starting at $40.55

$40.55

$40.55 ea.
Alloy Steel Square Bar 4142-Prehardened
0.375" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19357
Starting at $41.85

$41.85

$41.85 ea.
Alloy Steel Square Bar 4142-Prehardened [IN]
0.5" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19358
Starting at $46.23

$46.23

$46.23 ea.
Alloy Steel Square Bar 4142-Prehardened
0.625" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19359
Starting at $55.72

$55.72

$55.72 ea.
Alloy Steel Square Bar 4142-Prehardened
0.1875" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19354
Starting at $59.94

$59.94

$59.94 ea.
Alloy Steel Square Bar 4142-Prehardened
0.75" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19360
Starting at $70.56

$70.56

$70.56 ea.
Alloy Steel Square Bar 4142-Prehardened
1" Alloy Steel Square Bar 4142-Prehardened -
Part #: 19361
Starting at $111.40

$111.40

$111.40 ea.

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